Spanning Tree Setup between Nortel Passport 8600 and 5510

Hiya
Am trying to setup Spanning tree between two 5510s and a passport 8600 . i.e. a link coming out of passport 8600 is terminating at 5510 which is further chained to another 5510 and it has a link back to same passport.

I got it... heard it before too, we are a Cisco free zone (well almost but for a couple of firewalls) and we wish to keep it that way but in recent times it has been a battle, anyway to get this thread on track, for Hash Khan Spanning Tree is supported just turn it on at the port level, make sure you have only one link connected when you start, disable a port at the 8600 end, enable STP on each of the ports, but not fast spanning tree as that causes other issues in this scenario, once all port are STP enabled enable the port on the 8600 and after a little while you should have connectivity with one link blocked by STP.

Nortel is working the same way. L2 data spanning tree loop is automatically solved in default configuration. You can configure which port will be in Blocking state but you need to know theory of spanning tree.
We have more than 200 boxes in our LAN and we never use STP !!!

As Vladimir states Nortel/Avaya fully support spanning tree and to enable it is very simple, it usually on by default, but I also run Nortel L2 devices (More than 250) in fully meshed, squares and triangles without spanning tree, all links are active all of the time it is one of the great unsung features that has been around for years in Nortel switches.